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Remove WebMCP shim and align with native browser API - #16
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The test-time shim is gone: every suite now runs against the browser's own document.modelContext, which Playwright's Chromium provides behind --enable-features=WebMCP (the flag is in every Playwright config and in webmcp-audit). Chrome Beta stays as an informational CI job. The pre-spec provideContext, clearContext and unregisterTool are no longer recognised anywhere, and navigator.modelContext is no longer read. executeTool input is decided from the browser version (JSON string below Chrome 155, object from 155 on) instead of trying the object and retrying with a string, because a refused attempt is still an invocation on the CDP domain and was recorded as one. Contracts keep only annotation hints declared true, since builds differ in which false defaults getTools() fills in; `debugging` joins the hints toolHints() reads. The exposed-to-wildcard rule folds into exposed-to-secure-origins: the API has no wildcard, so "*" makes registerTool() reject rather than expose the tool to everyone. iframe-allow-tools is gone, since a frame without allow="tools" cannot register at all. declarative-autosubmit-sensitive now reads the autocomplete attribute it was meant to, and declarative schemas take the label text as a parameter description the way Chrome does. The promptApi harness and the fake LanguageModel follow Chromium's tool-use protocol: tool declarations without execute, tool-call items from prompt(), tool-response items back. The hand-written WebMCP typings are replaced by the webmcp-types package. The ESLint plugin is published as @swissspidy/eslint-plugin-webmcp, since eslint-plugin-webmcp is taken on npm. The pending changesets are collapsed into one initial-release changeset, and CHANGELOG.md ships with each package. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TLfNxra3U15xZ8xz1cHsE4
Six more webmcp-lint tool rules, which the plugin, the fixture and the audit all run: description-placeholder (TODO, lorem ipsum, ...), annotations-valid (the specification's four hints with boolean values; MCP hints and the CDP domain's spellings are named), exposed-to-origin-only (a path, query or credentials in an exposedTo entry is ignored by the API), and the opt-in tool-name-style, tool-title-missing and annotations-explicit. Six source-only ESLint rules, for what never survives to runtime: no-legacy-api (navigator.modelContext, window.agent, provideContext, clearContext, unregisterTool), no-unknown-tool-properties and no-unknown-options (dictionary members the API silently drops), require-execute, valid-event-name (toolchange, toolactivated, toolcancel) and no-unbound-method (a destructured registerTool throws). The recommended config now leaves opt-in rules out; `all` includes them. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TLfNxra3U15xZ8xz1cHsE4
A placeholder description is not a WebMCP problem, and the removed API surface is not worth a rule now that nothing here recognises it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TLfNxra3U15xZ8xz1cHsE4
annotations-valid, no-unknown-tool-properties, no-unknown-options, require-execute and no-unbound-method are gone: with webmcp-types installed TypeScript rejects every one of those mistakes, and the audience is TypeScript projects. valid-event-name stays, since the typings' string overload lets a misspelt event name through. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TLfNxra3U15xZ8xz1cHsE4
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📝 WalkthroughWalkthroughChangesNative WebMCP runtime
Core linting and analysis
Release and documentation updates
Priority: ➖ Normal Estimated code review effort: 5 (Critical) | ~90 minutes Change: Refactor Suggested reviewers: Merge Risk: 🟡 Moderate · up to Several native-WebMCP migration paths produce incorrect collection, contract, or linting behavior. Resolve these findings before merging so users receive valid launch guidance and reliable audit results. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 35.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 34 functions across 45 files. (24 skipped: 24 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@packages/core/README.md`:
- Line 58: Update the Puppeteer launch configuration in the example to include
the Chromium argument enabling WebMCP, so collectFrame can access
document.modelContext and discover imperative tools.
In `@packages/core/src/contract.ts`:
- Line 51: Update the annotation-copying loop in the contract construction flow
to preserve false-valued custom keys while still omitting false values only for
the standardized default-false annotation keys. Define or reuse the recognized
key set near the loop, and keep existing behavior for non-false values.
In `@packages/core/src/rules/exposure.ts`:
- Line 25: Update the exposedTo validation flow around the filter to parse each
entry with the URL parser before applying SECURE_ORIGIN and LOCAL_ORIGIN checks,
and reject parser failures with SecurityError consistently with
exposedToOriginOnly. Ensure malformed https:// and wss:// entries cannot pass
exposedToInsecure or allow registration to proceed.
In `@packages/eslint-plugin/src/api-usage.ts`:
- Around line 40-41: Restrict event-name validation in both the call and
property-assignment visitors to receivers identified as ModelContext. Resolve
the receiver before invoking validEventName, and skip validation when it is
absent or not a ModelContext instance, preserving existing
addEventListener/removeEventListener method filtering.
In `@packages/eslint-plugin/src/jsx.ts`:
- Around line 104-109: Update staticText() to recursively collect descendant
static text, not just direct JSXText children, matching browser label-text
derivation. During static extraction, build an id-to-text map for static
elements, then resolve each whitespace-separated aria-labelledby reference from
that map before deriving the field description so nested label content populates
prop.description.
- Line 173: Remove autocompleteValue === DYNAMIC from the field-wide dynamic
suppression condition in the JSX ESLint adapter, while retaining the other
dynamic checks so computed autocomplete values do not suppress missing-label or
missing-parameter-description findings.
In `@packages/playwright/README.md`:
- Around line 11-15: Add the missing `@playwright/test` import for defineConfig in
the playwright.config.ts documentation example so the copied configuration loads
correctly.
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📒 Files selected for processing (80)
.changeset/README.md.changeset/config.json.changeset/executetool-input-shape.md.changeset/fresh-tools-align.md.changeset/initial-release.md.changeset/injection-surface.md.changeset/lint-anywhere.md.changeset/require-node-24.md.changeset/shadowing-and-provenance.md.github/workflows/ci.ymlREADME.mdexamples/demo-site/bad.htmlexamples/demo-site/embed.htmlexamples/demo-site/frame.htmlexamples/demo-site/index.htmlexamples/demo-site/late.htmlexamples/demo-site/partner.htmlexamples/react-shop/README.mdexamples/react-shop/eslint.config.jsexamples/react-shop/package.jsonexamples/react-shop/playwright.config.jspackage.jsonpackages/audit/README.mdpackages/audit/package.jsonpackages/audit/playwright.config.tspackages/audit/src/cli.tspackages/audit/src/index.tspackages/audit/tests/audit.spec.tspackages/core/README.mdpackages/core/package.jsonpackages/core/src/annotations.tspackages/core/src/collect.tspackages/core/src/contract.tspackages/core/src/docs.tspackages/core/src/from-tools.tspackages/core/src/rules/declarative.tspackages/core/src/rules/exposure.tspackages/core/src/rules/index.tspackages/core/src/rules/page.tspackages/core/src/rules/quality.tspackages/core/src/rules/shadowing.tspackages/core/src/score.tspackages/core/src/types.tspackages/core/test/annotations.test.tspackages/core/test/cli.test.tspackages/core/test/extras.test.tspackages/core/test/from-tools.test.tspackages/core/test/lint.test.tspackages/eslint-plugin/README.mdpackages/eslint-plugin/package.jsonpackages/eslint-plugin/src/api-usage.tspackages/eslint-plugin/src/extract.tspackages/eslint-plugin/src/index.tspackages/eslint-plugin/src/jsx.tspackages/eslint-plugin/src/rule.tspackages/eslint-plugin/src/settings.tspackages/eslint-plugin/test/oxlint.test.tspackages/eslint-plugin/test/plugin.test.tspackages/playwright/README.mdpackages/playwright/package.jsonpackages/playwright/playwright.config.tspackages/playwright/src/cdp.tspackages/playwright/src/fake-language-model.tspackages/playwright/src/fixture.tspackages/playwright/src/index.tspackages/playwright/src/input-shape.tspackages/playwright/src/prompt-api.tspackages/playwright/src/recorder.tspackages/playwright/src/shim.tspackages/playwright/src/webmcp-types.tspackages/playwright/tests/calls.spec.tspackages/playwright/tests/contract.spec.ts-snapshots/demo-shop-chromium-linux.jsonpackages/playwright/tests/contract.spec.ts-snapshots/webmcp-contract-chromium-linux.jsonpackages/playwright/tests/crossorigin.spec.tspackages/playwright/tests/helpers.tspackages/playwright/tests/mock.spec.tspackages/playwright/tests/prompt-api.spec.tspackages/playwright/tests/shim.spec.tspackages/playwright/tests/smoke.spec.tspackages/playwright/tests/tools.spec.ts
💤 Files with no reviewable changes (11)
- packages/eslint-plugin/src/extract.ts
- .changeset/require-node-24.md
- .changeset/executetool-input-shape.md
- packages/playwright/src/shim.ts
- .changeset/injection-surface.md
- packages/playwright/src/webmcp-types.ts
- packages/playwright/tests/shim.spec.ts
- .changeset/shadowing-and-provenance.md
- packages/core/src/rules/page.ts
- .changeset/fresh-tools-align.md
- .changeset/lint-anywhere.md
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exposed-to-secure-origins runs every entry through the URL parser first, so
an entry that does not parse ("https://[invalid") is reported instead of
slipping past the scheme check; isPotentiallyTrustworthy() is exported.
Contracts drop a false value only for the hints the API defaults to false,
and keep any other key as declared. valid-event-name only judges listeners
on a receiver known to be document.modelContext, since any element may fire
its own tool* events. The JSX extractor collects nested label text, resolves
aria-labelledby, and no longer lets a computed autocomplete hide label
findings. Two README snippets gain the flag and the import they needed.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TLfNxra3U15xZ8xz1cHsE4
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This PR removes the test-time WebMCP shim and aligns the codebase with native browser implementations of the WebMCP API. The changes reflect that WebMCP is now natively supported in Chromium builds used by Playwright, eliminating the need for a polyfill.
Key Changes
Removed shim infrastructure: Deleted
packages/playwright/src/shim.tsand related test files (shim.spec.ts). TheshimSource()function andWebMCPOptions.shimconfiguration option are no longer needed.Updated API references: Changed all references from
navigator.modelContexttodocument.modelContextthroughout the codebase, aligning with the WebMCP specification and native browser implementations.Simplified fixture configuration: Removed the
shimoption fromWebMCPOptionsin the Playwright fixture. The fixture now assumes native WebMCP support is available.Updated tool input shape handling: Created new
input-shape.tsmodule to manageexecuteTool()input format (object vs JSON string), replacing the shim's dual-format support with explicit configuration.Refactored prompt API: Updated
prompt-api.tsto work with native tool-use protocol, removing shim-specific workarounds and aligning with Chromium'sAIPromptAPIToolUseimplementation.Updated fake language model: Modified
fake-language-model.tsto implement the tool-use protocol that Chromium uses, with properLanguageModelToolCallandLanguageModelToolSuccessclasses.Renamed ESLint plugin: Changed package name from
eslint-plugin-webmcpto@swissspidy/eslint-plugin-webmcpfor npm publication.Added quality rules: Introduced new linting rules in
quality.tsfor tool annotations and titles (annotations-explicit,tool-title-missing).Updated exposure rules: Refined
exposure.tsrules to better align with API security constraints and added support for WebSocket origins.Removed recorder wrapping of provideContext: The recorder now only wraps
registerTool()andexecuteTool(), asprovideContext()is not part of the native API surface.Updated documentation and examples: Changed all code examples and documentation to use
document.modelContextinstead ofnavigator.modelContext.Implementation Details
--enable-features=WebMCPflag passed by Playwright configurations.ExecuteToolInputShapetype, allowing tests to specify whether inputs should be objects or JSON strings.https://claude.ai/code/session_01TLfNxra3U15xZ8xz1cHsE4
Summary by CodeRabbit
New Features
Changes
@swissspidy/eslint-plugin-webmcp.